EP1270433B1 - Procédé d'inspection d'un bouchon monté sur une bouteille et appareil pour sa mise en oeuvre - Google Patents

Procédé d'inspection d'un bouchon monté sur une bouteille et appareil pour sa mise en oeuvre Download PDF

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Publication number
EP1270433B1
EP1270433B1 EP02254287A EP02254287A EP1270433B1 EP 1270433 B1 EP1270433 B1 EP 1270433B1 EP 02254287 A EP02254287 A EP 02254287A EP 02254287 A EP02254287 A EP 02254287A EP 1270433 B1 EP1270433 B1 EP 1270433B1
Authority
EP
European Patent Office
Prior art keywords
mark
bottle
cap
wrap
inspection according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02254287A
Other languages
German (de)
English (en)
Other versions
EP1270433A3 (fr
EP1270433A2 (fr
Inventor
Nobuyuki c/o Japan Crown Cork Co. Ltd Takakusaki
Yukihito c/o Japan Crown Cork Co Ltd. Nozaki
Yukio c/o Nidec Tosok Corporation Yoshikawa
Kazunori c/o Core-Labo Co Ltd. Nousou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Closures Co Ltd
Original Assignee
Japan Crown Cork Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001187168A external-priority patent/JP4798883B2/ja
Priority claimed from JP2002040981A external-priority patent/JP3966737B2/ja
Priority claimed from JP2002084314A external-priority patent/JP3910869B2/ja
Application filed by Japan Crown Cork Co Ltd filed Critical Japan Crown Cork Co Ltd
Publication of EP1270433A2 publication Critical patent/EP1270433A2/fr
Publication of EP1270433A3 publication Critical patent/EP1270433A3/fr
Application granted granted Critical
Publication of EP1270433B1 publication Critical patent/EP1270433B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/909—Investigating the presence of flaws or contamination in a container or its contents in opaque containers or opaque container parts, e.g. cans, tins, caps, labels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
    • B67B3/00—Closing bottles, jars or similar containers by applying caps
    • B67B3/26—Applications of control, warning, or safety devices in capping machinery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
    • B67B3/00—Closing bottles, jars or similar containers by applying caps
    • B67B3/26—Applications of control, warning, or safety devices in capping machinery
    • B67B3/262—Devices for controlling the caps
    • B67B3/264—Devices for controlling the caps positioning of the caps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9054—Inspection of sealing surface and container finish

Definitions

  • the present invention relates to a method of inspecting a wrap-fitted state (tightened state) of a cap wrap-fitted to the neck of a bottle and to an apparatus therefor. More specifically, the invention relates to a method capable of easily confirming a wrap-fitted state of a cap from one direction without opening the cap and to an apparatus therefor.
  • a bottle-cap assembly comprising a glass bottle or a plastic bottle and a cap having a tamper-evidence function for clearly indicating that the cap was once opened, it is essential that the cap is fitted in a completely sealed state after the content has been filled. So far, the fitted state was inspected by picking up some samples out of the products, really opening the cap to measure the torque for opening the cap and the angle of fitting.
  • the pick-up inspection is of a nature that is conducted for only some of the products. If the samples are picked up in a large number to improve the reliability of inspection, the cost of production increases correspondingly.
  • the torque is determined at the time of setting, first, the wrap-fitting condition according to the wrap-fitting angle to ensure a basic sealing performance. It is therefore desired that the wrap-fitting angle be easily measured.
  • Japanese Unexamined Patent Publication No. 12046/1997 discloses a sealing device in which one or a plurality of position indicator marks are formed at predetermined positions lower than the lower end of a plastic cap in a state where the cap is completely screwed onto the neck of a container, and seal indicator marks are formed on a skirt of the cap so as to be located by the side of the position indicator marks in a state where the cap is completely screwed onto the neck of the container.
  • Japanese Unexamined Patent Publication No. 203512/1998 discloses a method of inspecting the sealed state of the neck of a container by arranging marks on the outer periphery of the container and on the outer surface of a screw cap screwed onto the neck of the container, the marks having a predetermined positional relationship with respect to the ends of the respective threaded portions, and judging whether the screwed state of the screw cap is proper based on the positional relationship of the pair of marks (mark of the container and mark of the screw cap) after the screw cap has been mounted.
  • Japanese Unexamined Patent Publication No. 11504/1999 discloses a structure for sealing bottles by providing marks that can be viewed from the outer side on a portion corresponding to the starting end of the threaded portion at the neck of the bottle and on a portion corresponding to the terminating end of the threaded portion of the cap, to inspect the degree of the cap wrap-fitted to the neck of the bottle relying upon the positions of these two marks after the bottle is filled with the liquid and is sealed.
  • Japanese Unexamined Patent Publication No. 118515/2000 discloses an inspection method in which a portion of a cap mounted on the container body is imaged by using a camera, the imaged data is stored, and it is judged whether the mounting state of the cap is acceptable using the imaged data based upon a positional relationship between a reference position of the container body and a reference position of the cap.
  • the imaging is effected by using a first camera and a second camera arranged in parallel along the container conveyer passage.
  • the fitted state of the bottle-cap assembly can be confirmed without relying upon the inspection method of picking up the samples and really opening the caps.
  • German Patent application DE19540545A discloses a method of monitoring the sealing of caps on containers using an evaluation unit.
  • the method describes monitoring at least one continuous verticle profile in the transverse direction of the sealing cap using at least one laser light barrier.
  • the vertical profile can be monitored during movement of the container, and the measurements are then sent to a receiver for processing and detection of asymmetry in the vertical profile, indicating faults in the seal of the cap.
  • the marks formed on the bottle and on the cap must be positioned on a straight line or to establish a predetermined relationship, involving difficulty in setting the marks.
  • a predetermined reference range is provided concerning the positional relationship of the cap and the bottle, and the bottle-cap assemblies outside this range are excluded. Therefore, there does not arouse the problem of the sealing device of Japanese Unexamined Patent Publication No. 12046/1997 .
  • the mark of the cap is formed on the side surface of the cap due to the relationship to the bottle. In order to confirm that the marks of the bottle and of the cap are in a predetermined positional relationship, it is necessary to measure the mark from the side surface of the bottle-cap assembly.
  • the bottle-cap assemblies filled with the content and sealed with the caps are conveyed on the conveyer along the production line while changing their directions in a random fashion, and the marks formed on the bottle and on the cap are not necessarily headed toward the inspection device. Therefore, failure in the fitted state of the cap is often overlooked decreasing the reliability of inspection.
  • the mark (bottle mark) formed on the bottle and the mark (cap mark) formed on the cap are imaged by using a camera and the wrap-fitted state of the cap is inspected based on the obtained image, it is necessary that the two marks are vividly imaged.
  • the bottle mark it is often difficult to vividly image the bottle mark. That is, the bottle mark, in many cases, is formed on a portion on the outer surface of the neck of the bottle that is not covered with the cap, i.e., formed on a support ring.
  • the neck portion equipped with a portion forming a bottle mark such as a support ring is whitened due to crystallization, or the whole bottle inclusive of the neck is formed transparent,
  • the bottle mark is not, in many cases, vividly imaged.
  • the bottle wrap-fitted with the cap has been filled with the content liquid such as a beverage.
  • the neck of the bottle is transparent, the swinging level of the liquid in the bottle is reflected on the image caught by the camera and, as a result, the bottle mark is blurred.
  • Another object of the present invention is to provide a method of inspecting a wrap-fitted state of a cap by imaging the bottle mark and the cap mark by using a camera, wherein the bottle mark and the cap mark are vividly imaged even for transparent bottles having transparent necks irrespective of the kinds of the bottles, enabling the wrap-fitted state of the cap to be reliably inspected based upon the image processing.
  • the bottle mark and the cap mark are read out from the image data received by the image processor into polar coordinates with the cap as a center and, as required, are expanded to detect the positions thereof, the angle or the distance of expansion between the bottle mark and the cap mark is calculated, and whether the wrap-fitted state is acceptable is judged relying upon the angle or the expanded distance.
  • the illumination device is arranged to surround the optical lens, the optical path of light irradiated from said illumination device is so adjusted that the bottle mark and the cap mark are not directly irradiated with light but the portions of the skirt of the cap without forming the cap mark are directly irradiated with light, and the bottle mark and the cap mark are simultaneously shot by the camera while effecting the illumination by the illumination device under these conditions.
  • the cap mark and the bottle mark are vividly imaged even when the neck portion of the bottle inclusive of the support ring is transparent,
  • a device for inspecting a wrap-fitted state of a cap of a bottle-cap assembly in which the cap is wrap-fitted to the neck of a bottle, by detecting a positional relationship between a bottle mark formed on the bottle and a cap mark formed on the cap comprising: an optical lens arranged at a higher position on the vertical center axis of said bottle-cap assembly in a manner that the vertical center axis is optical in agreement with an optical axis thereof; a single camera, arranged at a higher position on the optical axis of said optical lens, for simultaneously shooting the bottle mark and the cap mark through the optical lens; an illumination device for illuminating the bottle mark and the cap mark or the vicinities thereof; and an image processor arranged for reading out the bottle mark and the cap mark from the image data shot by the camera, and to detect a positional relationship between the bottle mark and the cap neck; expand, as required, the bottle mark and the cap mark; calculate the angle or the distance of expansion between the bottle
  • Fig. 1 is a view illustrating the arrangement of the inspection device for conducting the inspection method of the present invention.
  • an optical lens 40 and a camera 50 having a CCD imaging element for imaging a cap mark formed on the cap and a bottle mark formed on the support ring of the bottle (these marks are not shown in Fig. 1 ), in a manner that the vertical axis of the assembly 30 is in agreement with the optical axis of the optical system (optical lens 40 and camera 50).
  • An illumination device 60 is circularly arranged to surround the optical lens 40.
  • the camera 50 is accommodated in a cylindrical hood 51 of which the lower end is opened.
  • the lens 40 is arranged at the center of the opening of the hood 51, and an optical path between the lens 40 and the camera 50 is covered'with the cylindrical hood 51.
  • an image processor (image processing computer) 70 for processing image data sent from the camera 50 through a cable 52, and a monitor 75 for displaying the image data and the result of inspection.
  • the vertical axis of the bottle-cap assembly 30 is in agreement with the optical axis of the optical system (optical lens 40 and camera 50) and, besides, the illumination device is arranged to illuminate the cap mark and the bottle mark, whereby it is allowed to simultaneously shoot the bottle mark and the cap mark using the camera 50. Even when the bottle mark is positioned on the inside of the outer peripheral edge of the cap in the radial direction, the bottle mark can be shot together with the cap mark.
  • the wrap-fitted state of the cap is evaluated based on the image data of the cap mark and the bottle mark imaged by the camera 50. That is, the positions of the cap mark and of the bottle mark are read onto a polar coordinate from the image shot by the camera 50, and, as required, are expanded to correctly evaluate the wrap-fitted state.
  • the wrap-fitted angle of the cap ( ⁇ 0 which is also determined by the angle of the cap mark based on the bottle mark) of the bottle-cap assembly 30 in a suitably wrap-fitted state or the expanded distance (L 0 ) thereof is set in advance within a predetermined allowable range, and the wrap-fitted angle ⁇ detected above is compared with the preset wrap-fitting angle ⁇ 0 , or the expanded distance (L) that is detected is compared with the preset expanded distance (L 0 ) to detect whether the wrap-fitted state is acceptable.
  • the direction of the angle is positive in the counterclockwise direction.
  • the cap is fitted by being turned in the clockwise direction. Therefore, the coordinate may be considered backside front.
  • the optical axis of the optical lens 40 and of the camera 50 are brought into agreement with the vertical axis of the bottle-cap assembly 30, and the bottle mark P and the cap mark Q are simultaneously taken into the two-dimensional image through the camera 50.
  • the relative positional relationship between the bottle mark P and the cap mark Q is detected through a simple image processing without effecting cumbersome and complex processing to detect whether the wrap-fitted state of the cap is acceptable,
  • the cap which is generally designated at 1 comprises a top panel 2 and a skirt 4 having hanging down from the top panel 2 via a corner portion 3 positioned along the peripheral edge of the top panel 2.
  • a tamper-evidence (TE) band 5 is provided at the lower end of the skirt 4 via a weakened portion 6.
  • a liner member 7 is formed on the inner surface of the top panel 2 of the cap, and the outer peripheral protruded portion of the liner member comes in contact with the outer surface of the bottle neck to enhance the sealing of the container.
  • the outer surface of the skirt 4 is knurled as designated at 8 for easy gripping, and the inner surface thereof is threaded as designated at 9 so as to be screwed onto the thread formed on the bottle neck.
  • flap pieces 10 are formed on the inner surface of the TE band 5 so as to secure the TE band by being engaged with the beads of the bottle portion that will be described later.
  • the bottle used in the present invention has a bottle neck 20 which, though not shown, is integrally continuous to the shoulder portion, barrel and bottle portion like an ordinary bottle.
  • a threaded portion 21 is formed on the outer surface of the neck 20 so as to be screwed into the cap to seal the bottle.
  • a stepped portion 22 is formed under the threaded portion 21 so as to be engaged with the flap pieces 10 of the TE band 5 of the cap.
  • a support ring 23 is formed under the stepped portion 22 for holding the bottle at the time of filling and sealing.
  • the support ring 23 has an outer diameter equal to, or greater than, the outer diameter of the greatest portion under the cap 1 or under the TE band.
  • the cap mark Q and the bottle mark P are simultaneously imaged by using the camera 50 arranged over the bottle-cap assembly 30.
  • the cap mark Q is formed on the peripheral edge of the top panel 2 of the cap, on the corner portion 3 between the top panel 2 and the skirt 4, or on the outer surface of the skirt 4.
  • the bottle mark P is usually formed on the support ring 23 of the bottle. These marks are formed at predetermined portions as grooves or protuberances. Their shapes and sizes will be described later.
  • the cap is usually opaque enabling the mark to be easily recognized.
  • the whitened bottle neck 20 having the support ring 23 reflects light in large amounts enabling the mark to be easily detected compared to that of when the bottle neck is transparent.
  • light is reflected in small amounts, and it often becomes difficult to detect the mark. In such a case, therefore, there can be employed such means that coarsens the surface of the groove or of the protuberance forming the bottle mark P.
  • the cap mark Q is formed on the peripheral edge of the top panel 2
  • the bottle mark P is formed on the upper surface or on the outer peripheral portion of the support ring 23 of the bottle.
  • the cap mark Q is formed at a position from where the threaded portion 9 starts on the inner surface of the skirt 4, i.e., formed on the peripheral edge of the top panel 2 of the cap corresponding to a position 12 from where the cap starts screwing onto the bottle.
  • the bottle mark P is formed at a position from where the threaded portion 21 starts on the bottle neck 20, i.e., formed on the outer periphery of the support ring 23 corresponding to a position 25 from where the bottle starts screwing into the cap.
  • auxiliary mark R at the center of the top panel 2 of the cap as shown in Fig. 6 .
  • the angle of wrap-fitting of the cap 1 in the bottle-cap assembly 30 can be easily measured relying upon the cap mark Q, auxiliary mark R and bottle mark P.
  • Fig. 6 is a plan view illustrating, on an enlarged scale, a portion of another bottle-cap assembly 30 which is the combination of a cap and a bottle.
  • the cap 1 is wrap-fitted by being turned in the direction of an arrow X in the drawing.
  • the bottle mark P formed on the support ring 23 of the bottle is at a lower-limit position capable of reliably guaranteeing the wrap-fitting of the cap.
  • the cap mark Q formed on the peripheral edge of the top panel of the cap exceeds the bottle mark P, there is no problem concerning the fitted state of the bottle-cap assembly 30 provided the cap mark Q lies within a predetermined range.
  • the auxiliary mark R is formed at the center of the top panel of the cap, and the wrap-fitted state can be confirmed relying upon an angle ⁇ defined by the bottle mark P, auxiliary mark R and cap mark Q.
  • the normal wrap-fitting position represented by the relationship of marks Q and P formed on the cap and on the bottle is not limited to the above-mentioned embodiment only but various other embodiments can be employed.
  • the bottle mark P may be formed at a position corresponding to the position from where the threaded portion starts (portion 25 shown in Fig. 5 ), and the cap mark Q may be formed at a position corresponding to a position from where the threaded portion starts (portion 12 in Fig. 2 ), so that it can be learned at a glance how much the cap is wrap-fitted depending upon the position of the cap mark Q with the bottle mark P as a reference.
  • the angle ⁇ in a range of arrows Y-Y is the one for wrap-fitting. In the wrap-fitted state, it is determined in advance the angle ⁇ in what range is suited for the wrap-fitting.
  • the auxiliary mark R may be formed at a position symmetrical to the cap mark Q to facilitate the measurement of the angle ⁇ .
  • the auxiliary mark R too, can be formed as a recessed portion or as a protuberance like the marks P and Q.
  • the cap mark and the bottle mark may be so set as to come nearly at the same positions in a state where the bottle-cap assembly 30 is wrap-fitted.
  • the bottle-cap assembly 30 to which the inspection method of the invention is adapted can be used for various bottles and caps.
  • the bottles may be draw-blown bottles made of a synthetic resin such as polyethylene terephthalate, and bottles produced by the injection-molding.
  • the bottles may be glass bottles, as a matter of course.
  • the caps may be those of olefinic resins such as polyethylene, polypropylene, etc., those obtained by the compression-molding or injection-molding synthetic resins such as vinyl chloride resin or the like, as well as those of a metal such as aluminum or the like.
  • the cap has the TE band integrally formed at the lower end of the cap through a weakened portion.
  • the cap may not have the TE band when it is covered with a shrink film after wrap-fitted.
  • the lens 40 is a piano-convex lens or a meniscus convex lens having a diameter larger than that of the cap from the standpoint of vividly imaging not only the cap mark Q but also the bottle mark P.
  • the bottle mark P (a) may be positioned on the outer side of the outermost circumference of the cap in the radial direction, (b) may be overlapped on the outermost circumferential portion of the cap, or (c) may be positioned on the inner side of the outermost circumference of the cap in the radial direction.
  • the bottle mark P is in the cases (b) and (c), it is geometrically almost impossible to detect the bottle mark P from the upper side in the axial direction.
  • the piano-convex lens or the meniscus convex lens having a diameter larger than the diameter of the cap it is allowed to form a clear image of the bottle mark P even in the above-mentioned cases (b) and (c) by guiding light traveling aslant toward the upper outer direction from the bottle mark P to enter into the lens, and by refracting light. Further, the area of light ray taken in from the bottle mark P can be widened, offering advantage from the standpoint of increasing the density of image of the bottle mark P and improving the contrast.
  • the lens 40 is a plano-convex lens having a diameter larger than the diameter of the cap, i.e., having a diameter about three times as great as the diameter of the cap, and the plane surface of the plano-convex lens is facing the bottle-cap assembly 30.
  • the piano-convex lens has a diameter about 2 to about 4 times as large as the diameter of the cap. It is further allowable to enhance the focusing power from the bottle mark P by using the meniscus convex lens instead of using the plano-convex lens.
  • the lens 40 it is desired to so arrange the lens 40 that the cap mark Q and the bottle mark P are located within the photographing depth (also called the depth of a focus) of the lens 40.
  • the lens When the focal distance is gradually extended to a distance, the lens becomes in focus up to infinity over a certain distance. This distance is called over-focal distance.
  • the focal distance of the lens is denoted by f
  • allowable blurring by A
  • the photographing depth stands for a range in which not only a subject is vividly imaged at a distance to which the focal point is adjusted but also ranges in front of, and at the back of, the above range in which the subjects are vividly imaged.
  • the focal distance f of the lens is selected, the F-number (iris) of the lens is selected and the distance d 0 to which the focal point is adjusted is selected, so that the cap mark Q and the bottle mark P enters into the photographing depth of the lens.
  • the angle of wrap-fitting the cap to the bottle-cap assembly 30 is inspected by the image processor (image processing computer) 70 and the camera 50 based on a flowchart shown in Fig. 8 .
  • an operation signal of the inspection apparatus is detected.
  • a signal of detecting the bottle-cap assembly 30 from the camera 50 is waited for.
  • the image data from the camera 50 are sent to the image processor (image processing computer) 70.
  • the center of the bottle-cap assembly 30 is detected.
  • the center may be detected by forming the auxiliary mark R at the center of the top panel of the cap as described earlier or by effecting the centering from the circumference of the top plate of the cap.
  • the image data on the two-dimensional coordinate are developed into polar coordinates as described in connection with Fig. 2 to thereby detect the cap mark Q and the bottle mark P.
  • the detected angle ⁇ of wrap-fitting is compared with the preset angle ( ⁇ 0 ) of wrap-fitting, or the detected distance (L) is compared with the preset distance (L 0 ) to detect whether the wrap-fitting is acceptable. That is, when the angle or the distance lies outside the range, it means that the wrap-fitting state is faulty. When the angle or the distance lies within the range, the routine returns to the measurement of the next time.
  • the circular illuminating device 60 is arranged to surround the lens 40, and the camera 50 takes an image in an illuminated condition.
  • the illuminating device 60 may be the known one such as an LED, a fluorescent lamp or a halogen lamp. From the standpoint of adjusting the light path of the illuminating device 60, however, the LED is most desired as will be described below.
  • the illumination is obtained by using the illuminating device 60 so as to satisfy predetermined conditions.
  • the lens 40 is provided inside the opening at the lower end of the hood 51', and the illuminating device 60 is annularly provided on the outer side thereof via a suitable mounting plate 65 by using screws.
  • the bottle-cap assembly 30 is arranged as shown in Fig. 1 .
  • a light-shielding plate 68 is mounted on the illuminating device 60, and light L from the illuminating device 60 is adjusted for its light path by the light-shielding plate 68 so as to be directly incident upon the skirt 4 of the cap 1.
  • the cap mark Q has not been formed on the irradiated portion. Therefore, neither the cap mark Q nor the bottle mark P is directly irradiated with light.
  • the image is taken by the camera 50 while permitting the skirt 4 of the cap 1 to be directly irradiated with light but without permitting the cap mark Q and the bottle mark P to be directly irradiated with light. Therefore, both the cap mark Q and the bottle mark P are caught as vivid images. If the cap mark Q and the bottle mark P are directly irradiated with light, these marks directly irradiated with light are caught as images having a very low contrast over the vicinity areas thereof, the discrimination thereof becomes difficult, and it becomes difficult to correctly conduct the above-mentioned image processing. Illumination that satisfies the above-mentioned conditions makes it possible to effectively avoid the above-mentioned inconvenience.
  • the cap mark Q may be formed on the outer surface of the skirt 4. In this case, as a matter of course, it becomes necessary to move the portion directly irradiated with light away from the portion where the cap mark Q is formed, so that the skirt 4 is directly irradiated with light.
  • the illumination is effected so as to satisfy the above-mentioned conditions to catch both the cap mark Q and the bottle mark P as vivid images. This advantage is not spoiled even when the invention is applied to a transparent bottle having a transparent neck 20 and a transparent support ring 23.
  • the swinging level of the liquid contained in the bottle is reflected on the image of the bottle mark P, causing the image of the bottle mark P to be blurred and obscured.
  • the direct light from the illuminating device 60 falls on the skirt 4 of the cap 1 but is prevented from falling directly on the neck 20 of the bottle such as the support ring 23. Therefore, only a small quantity of light arrives at the liquid level in the bottle and, hence, light reflected by the liquid level is effectively suppressed. Accordingly, the swinging level of the liquid in the bottle is not reflected on the image of the bottle mark P. Even in the case of the transparent bottle, therefore, the bottle mark P is vividly imaged and is reliably discriminated.
  • the cap mark Q and the bottle mark P are vividly imaged at all times. Therefore, despite of using means for imaging the marks by using a single camera 50 from the upper side, there is obtained a distinguished advantage of reliably judging even a lack of the wrap-fitting by 360 degrees (one turn) of the cap.
  • Figs. 10 and 11 are diagrams illustrating major portions of the images of the bottle-cap assemblies 30 input through the camera and the expansions of the polar coordinates thereof, wherein Fig. 10 is that of the bottle-cap assembly 30 to which the cap is normally wrap-fitted, and Fig. 11 is that of the bottle-cap assembly 30 to which the cap is insufficiently wrap-fitted by one turn (360 degrees).
  • symbol A denotes a recessed portion formed in the support ring 23 of the bottle, and either side a or b at both ends in the circumferential direction is recognized as the bottle mark P.
  • the gap is very small between the support ring 23 of the bottle and the lower end of the cap (e.g., lower end of the TE band).
  • the central portion of the cap in the recessed portion A is not imaged but the portion of the support ring 23 on the side of the peripheral edge thereof only is vividly imaged. Therefore, the bottle mark P shown by the expansion of the polar coordinate has a short length L 1 .
  • the length L 1 of the bottle mark P of when the cap is normally wrap-fitted is stored in the image processor and, hence, even a lack of wrap-fitting by 360 degrees is reliably judged from the relation to the length L 1 .
  • the sizes and shapes of the cap mark Q and of the bottle mark P are so determined that clear and vivid images are obtained through the imaging by using the camera 50 and through the image processing.
  • the cap mark Q is desirably formed as a circular recessed portion having a diameter of from about 0.5 to about 1.5 mm from the standpoint of recognizing the mark.
  • the bottle mark P is formed on the support ring 23 of the bottle as a recessed portion or a protuberance having a suitable width W (maximum length in the circumferential direction).
  • W maximum length in the circumferential direction
  • the bottle mark P usually has a triangular shape or a rectangular shape such as a trapezoidal shape, an elongated shape or a parallelogram, and, at least one of the pair of sides extending toward the inside of the bottle from the peripheral edges of the support ring 23 is recognized as the bottle mark P.
  • the nail mark of the jig is formed on the lower surface of the support ring 23.
  • the inspection method of the present invention is applied to the bottle of which the neck 20 has not yet been thermally crystallized but is still transparent, i.e., applied to the bottle having a transparent support ring 23
  • the nail mark of the jig is also caught as an image together with the bottle mark P, making it difficult to distinguish the bottle mark P from the nail mark of the jig.
  • Figs. 12 and 13 are diagrams illustrating the images through the camera of the recessed portion or of the protruded portion A utilized for recognizing the bottle mark P and the expansions of the polar coordinates thereof.
  • the nail mark of the jig (designated at 90) is imaged.
  • a triangle with the peripheral edge 23a of the support ring 23 as a base is shown in Fig. 12
  • a trapezoid with the peripheral edge 23a of the support ring 23 as a base is shown in Fig. 13 .
  • a maximum width w of the recessed portion or of the protuberance A in the circumferential direction is set to be from 3 to 8 mm, and is so programmed in the above-mentioned image processor 70 as to recognize the pair of sides a and b extending into the interior of the bottle from the peripheral edge of the support ring 23 as the bottle mark P.
  • the nail mark 90 of the jig formed on the lower surface of the support ring 23 is, in many cases, a substantially straight line as shown in Figs. 12 and 13 , and is extending toward the center of the bottle from the peripheral edge 23a of the support ring 23.
  • a combination of the pair of sides a and b of the recessed portion or of the protuberance A having a maximum width w in the circumferential direction, is recognized as the bottle mark P, making it possible to reliably distinguish the bottle mark P from the nail mark 90, to correctly detect relative positions of the bottle confirmation mark P and of the cap confirmation mark Q, and to correctly detect the wrap-fitted state of the cap.
  • the maximum width w of the recessed portion or of the protuberance A in the circumferential direction becomes smaller than the above range, the gap between the pair of sides a and b to be recognized as the bottle mark P is so narrow that it becomes difficult to distinguish it from the nail mark 90.
  • the maximum width w in the circumferential direction is increased to be greater than the above range, rather creating a large error in the position of the bottle mark P which is recognized as the pair of sides a and b and, further, and spoiling the appearance of the bottle. It is therefore desired that the maximum width w in the circumferential direction lies within the above-mentioned range.
  • the angle ⁇ of inclination of the sides a and b is not smaller than 15 degrees, and is so programmed in the image processor 70 as to recognize the pair of sides a and b having the above-mentioned maximum width w and the angle ⁇ of inclination as the bottle mark P.
  • the nail mark 90 when the nail mark 90 is located close to either the side a or the side b (when, for example, the gap between the nail mark 90 and the side a or b is smaller than the above-mentioned maximum width w), it may happen that the pair of the nail mark 90 and the side a or b is incorrectly recognized as the bottle mark P.
  • the angle of inclination of the nail mark 90 with respect to the straight line z is substantially zero.
  • the angle ⁇ of inclination as a parameter for recognizing the bottle mark P, therefore, it is allowed to reliably avoid the above incorrect recognition.
  • the upper limit of the angle ⁇ of inclination of the sides a and b is not larger than 75 degrees.
  • the angle ⁇ of inclination is close to 90 degrees, it becomes difficult to distinguish the side a or b from the peripheral edge 23a of the support ring 23. Further, when the angle ⁇ of inclination of the side a or b is used as a parameter for recognizing the bottle mark P, though there is no particular limitation, it is, usually, desired that the recessed portion or the protuberance A has a triangular shape as shown in Fig. 12 .
  • the length d is also allowable to use the length d as a parameter for recognizing the bottle mark P instead of using the angle ⁇ of inclination of the sides a and b. That is, as shown in Fig. 13 , the lengths of the sides a and b are set to be not smaller than 2 mm, respectively, and are so programmed in the image processor 70 as to recognize the pair of sides a and b having the above-mentioned maximum width w and the length d as the bottle mark P.
  • the nail mark 90 is caused by the jig that is used for preventing the bottle from turning, and its length D is relatively short and remains constant. Therefore, even by setting the length of the sides a and b to be larger than the length D of the nail mark 90, it is allowed to reliably avoid such inconvenience that the pair of the nail mark 90 and the side a or b is incorrectly recognized as the bottis mark P.
  • the upper-limit value of the length d of the sides a and b is, usually, not larger than 4 mm. Even if the length d is set to be unnecessarily great, the recessed portion or the protuberance A formed on the support ring 23 simply becomes unnecessarily great.
  • the recessed portion or the protuberance A has a rectangular shape such as a trapezoidal shape as shown in Fig. 13 .
  • the bottle mark P recognized by using three parameters, i.e., by using the above-mentioned maximum width w, angle ⁇ of inclination and length d.
  • the recessed portion or the protuberance A may have a triangular shape or a rectangular shape as viewed from the upper side.
  • the cap mark and the bottle mark are imaged and are caught as vivid images under a condition where neither the cap mark nor the bottle mark is directly irradiated with light. Therefore, even when the support ring forming the bottle mark is transparent, it is allowed to correctly detect the positional relationship between the two marks and to precisely inspect the wrap-fitted state of the cap.
  • a maximum width in the circumferential direction of the recessed portion or the protrusion formed on the upper surface of the transparent support ring is set to be not smaller than a predetermined value, and a combination of the pair of sides of when the recessed portion or the protrusion is viewed from the upper side is recognized as a bottle mark, making it possible to reliably distinguish the nail mark of the jig formed on the lower surface of the support ring from the bottle mark.

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  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Immunology (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Sealing Of Jars (AREA)
  • Closures For Containers (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Claims (15)

  1. Procédé d'inspection d'un état de montage serré d'un bouchon (1) d'un ensemble bouteille-bouchon (30) dans lequel le bouchon (1) possédant un panneau supérieur (2) et une jupe (4) est monté serré sur un goulot d'une bouteille (20), en détectant une relation positionnelle entre une marque de bouteille (P) formée sur la bouteille et une marque de bouchon (Q) formée sur le bouchon ; dans lequel
    une lentille optique (40) est disposée dans une position plus élevée sur l'axe central vertical dudit ensemble bouteille-bouchon (30) de manière telle que l'axe central vertical coïncide avec un axe optique de celle-ci ;
    un appareil de prise de vue unique (50) est disposé dans une position plus élevée sur l'axe optique de ladite lentille optique (40) pour réaliser une image de la marque de bouteille et de la marque de bouchon à travers la lentille optique (40) ;
    un dispositif d'éclairage (60) est disposé pour éclairer la marque de bouteille et la marque de bouchon (Q) ou les voisinages de celles-ci ; et
    la marque de bouteille (P) et la marque de bouchon (Q) sont simultanément prises en image par l'appareil de prise de vue (50), et l'image obtenue est envoyée à un processeur d'image (70) pour détecter une relation positionnelle entre la marque de bouteille (P) et la marque de bouchon (Q).
  2. Procédé d'inspection selon la revendication 1, dans lequel ladite marque de bouchon (Q) est formée sur un bord périphérique du panneau supérieur (2), sur une partie d'angle entre le panneau supérieur (2) et la jupe (4) ou sur une surface extérieure de la jupe, et ladite marque de bouteille (P) est formée sur une bague de support (23) de la bouteille.
  3. Procédé d'inspection selon la revendication 1, dans lequel la lentille optique (40) est une lentille plan-convexe ou une lentille ménisque convexe possédant un diamètre supérieur au diamètre du bouchon (1).
  4. Procédé d'inspection selon la revendication 1, dans lequel la marque de bouchon (Q) et la marque de bouteille (P) sont prises en image dans une condition dans laquelle les deux sont situées au sein d'une profondeur de prise de vue de la lentille optique (40).
  5. Procédé d'inspection selon la revendication 1, dans lequel la marque de bouteille (P) et la marque de bouchon (Q) sont lues à partir de données d'image reçues par le processeur d'image (70) dans des coordonnées polaires avec le bouchon (1) en tant que centre et, si nécessaire, sont agrandies pour détecter les positions de celles-ci, l'angle ou la distance d'agrandissement entre la marque de bouteille (P) et la marque de bouchon (Q) est calculé, et il est estimé si l'état de montage serré est acceptable d'après l'angle ou la distance agrandie.
  6. Procédé d'inspection selon la revendication 1, dans lequel le dispositif d'éclairage (60) est disposé pour entourer la lentille optique (40), le trajet optique de lumière irradiée à partir dudit dispositif d'éclairage (60) est réglé de sorte que la marque de bouteille (P) et la marque de bouchon (Q) ne soient pas directement irradiées par la lumière, mais que les parties de la jupe (4) du bouchon (1) sans former la marque de bouchon soient directement irradiées par la lumière, et la marque de bouteille (P) et la marque de bouchon (Q) sont simultanément prises en image par l'appareil de prise de vue (50) tout en effectuant l'éclairage par le dispositif d'éclairage (60) dans ces conditions.
  7. Procédé d'inspection selon la revendication 6, dans lequel le goulot de ladite bouteille (20) est transparent, et ladite marque de bouteille (13) est formée dans une partie de bord périphérique sur la surface supérieure d'une bague de support transparente (23) formée sur le goulot (20).
  8. Procédé d'inspection selon la revendication 7, dans lequel ladite marque de bouteille (P) est une partie en retrait ou une protubérance possédant une largeur maximum (w) de 3 à 8 mm dans la direction circonférentielle de la bague de support (23), et dans la réalisation de l'image de la partie en retrait ou de la protubérance en utilisant ledit appareil de prise de vue (50), ladite marque de bouteille (P) est programmée dans un processeur d'image (70) afin de reconnaître, en tant que marque de bouteille (P), une combinaison d'une paire de côtés de la partie en retrait ou de la protubérance s'étendant vers l'intérieur à partir du bord périphérique de la bague de support (23).
  9. Procédé d'inspection selon la revendication 8, dans lequel une paire de côtés de la partie en retrait ou de la protubérance possède un angle (θ) d'inclinaison au moins non inférieur à 15 degrés par rapport à une ligne droite s'étendant dans la direction radiale à partir du centre de la bouteille, et sont programmés dans le processeur d'image (70) afin de reconnaître, en tant que marque de bouteille (P), ladite paire de côtés sur la base de ladite largeur maximum (w) et dudit angle (θ) d'inclinaison.
  10. Procédé d'inspection selon la revendication 9, dans lequel ladite partie en retrait ou ladite protubérance présente une forme triangulaire en vue de dessus.
  11. Procédé d'inspection selon la revendication 8, dans lequel une paire de côtés de la partie en retrait ou de la protubérance possède une longueur (d) non inférieure à 2 mm, et est programmée dans le processeur d'image (70) afin de reconnaître, en tant que marque de bouteille (P), ladite paire de côtés sur la base de ladite largeur maximum (w) et de ladite longueur (d).
  12. Procédé d'inspection selon la revendication 11, dans lequel ladite partie en retrait ou ladite protubérance présente une forme rectangulaire en vue de dessus.
  13. Dispositif pour inspecter un état de montage serré d'un bouchon d'un ensemble bouteille-bouchon (30) dans lequel le bouchon (1) possédant un panneau supérieur (2) et une jupe (4) est monté serré sur un goulot d'une bouteille (20), en détectant une relation positionnelle entre une marque de bouteille (P) formée sur la bouteille et une marque de bouchon (Q) formée sur le bouchon (1), comprenant :
    une lentille optique (40) disposée dans une position plus élevée sur l'axe central vertical dudit ensemble bouteille-bouchon (30) de manière telle que l'axe central vertical coïncide avec un axe optique de celle-ci ;
    un appareil de prise de vue unique (50), disposé dans une position plus élevée sur l'axe optique de ladite lentille optique (40), pour simultanément prendre une image de la marque de bouteille (P) et de la marque de bouchon (Q) à travers la lentille optique (40) ;
    un dispositif d'éclairage (60) disposé pour éclairer la marque de bouteille (P) et la marque de bouchon (Q) ou les voisinages de celles-ci ; et
    un processeur d'image (70) disposé pour lire la marque de bouteille (P) et la marque de bouchon (Q) à partir des données d'image prises par l'appareil de prise de vue (50), et pour détecter une relation positionnelle entre la marque de bouteille (P) et la marque de bouchon (Q).
  14. Dispositif d'inspection selon la revendication 13, dans lequel le processeur d'image (70) est adapté pour :
    agrandir, si nécessaire, la marque de bouteille (P) et la marque de bouchon (Q) ;
    calculer l'angle ou la distance d'agrandissement entre la marque de bouteille (P) et la marque de bouchon (Q) ; et
    estimer si l'état de montage serré est acceptable d'après l'angle ou la distance agrandie.
  15. Dispositif d'inspection selon la revendication 13 ou 14, dans lequel la lentille optique (40) est une lentille plan-convexe ou une lentille ménisque convexe possédant un diamètre supérieur au diamètre du bouchon (1).
EP02254287A 2001-06-20 2002-06-20 Procédé d'inspection d'un bouchon monté sur une bouteille et appareil pour sa mise en oeuvre Expired - Lifetime EP1270433B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2001187168A JP4798883B2 (ja) 2001-06-20 2001-06-20 ボトル・キャップ組立体の検査方法及び装置
JP2001187168 2001-06-20
JP2002040981A JP3966737B2 (ja) 2002-02-19 2002-02-19 ボトル・キャップ組立体におけるキャップ巻締状態の検査方法
JP2002040981 2002-02-19
JP2002084314A JP3910869B2 (ja) 2002-03-25 2002-03-25 キャップ巻締状態の検出方法
JP2002084314 2002-03-25

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EP1270433A3 EP1270433A3 (fr) 2004-11-24
EP1270433B1 true EP1270433B1 (fr) 2011-02-23

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EP1270433A3 (fr) 2004-11-24
DE60239245D1 (de) 2011-04-07
US20020196434A1 (en) 2002-12-26
US6643009B2 (en) 2003-11-04
KR100900019B1 (ko) 2009-06-01
KR20020097020A (ko) 2002-12-31
EP1270433A2 (fr) 2003-01-02

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